Melvin jinks



UNITED STATES PATENT OFFICE. a

MELVIN JINKS, OF WAYLAND, NEW YORK.

TURNKEY.

Specification of Letters Patent No; 10,312, dated December 13, 1853.

To all 'whom t may concern:

Be it known that I, MELVIN JINKS, of Wayland, in the county of Steuben and State of New York, have invented certain new and useful Improvements in Turnkeys for Extracting Teeth; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1, is a perspective View of a turnkey having my improvements. Fig. 2, is a transverse section of the same through the fulcrum and claws. Fig. 3, is a detached view of the additional claw.

Similar letters of reference indicate corresponding parts in each gure.

The nature of this invention consists, firstly, in substituting for the fixed prop or fulcrum commonly employed a rolling fulcrum which lies against the gum and rolls on the key as it is twisted, and secondly., in furnishing the turnkey with an additional claw for the purpose of catching the tooth on the same side as the fulcrumand opposite to the ordinary hook claw.

The object of these improvements isto enable the key to draw the tooth directly from the jaw instead of racking it over at the side and thereby marring the gums and frequently breaking the jaw.

A, is the shaft of the key or as it is com monly termed the lever, having the knuckle a, near its extremity to receive the hook claw Z2, which hangs on a pivot c, inserted through the knuckle.

B, is the rolling fulcrum ywhich is pivoted to the end of the shaft A, and allowed to rock or roll a slight distance on it, being prevented from rolling too far in either direction by small shoulders e, e, on the knuckle a. There is an openspace between the back of the hook claw and the back partof the knuckle to receive the shank d, of the additional claw E. This cla-w E, is quite short and of such form that its point will seize the tooth on the outside close to the gum, and the shank is hollowed above and below to fit within the rounded parts g, of the back of the hook claw, and 7L, of the back of the knuckle, in such a manner as to be held in place but to be allowed a slight amount of play up or down. The back part of the claw E, is shouldered at z', z', to bear against the knuckle a.

In extracting a tooth the fulcrum B, is placed against the outside .of the jaw in such a position as to bring the point of the y claw E, to bear uponv the toot-h close to the gum, and the `point of the claw b, is brought into action on the tooth in the ksame way as the common turnkey. When the turnkey is turned the rolling fulcrum adjusts itself to the aw or gum and the end of the key turns in the fulcrum,` so that the fulcrum does not slide on the jaw or gum, and the two claws moving together and holding the tooth on each side drawthe tooth directly instead ofI MELvIN .TiNKs Witnesses: i i

ORSON MosHER, A. S. DAVIS. 

